100+0.9=x

Solution for 100+0.9=x equation:

Simplifying
100 + 0.9 = x

Combine like terms: 100 + 0.9 = 100.9
100.9 = x

Solving
100.9 = x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-1x' to each side of the equation.
100.9 + -1x = x + -1x

Combine like terms: x + -1x = 0
100.9 + -1x = 0

Add '-100.9' to each side of the equation.
100.9 + -100.9 + -1x = 0 + -100.9

Combine like terms: 100.9 + -100.9 = 0.0
0.0 + -1x = 0 + -100.9
-1x = 0 + -100.9

Combine like terms: 0 + -100.9 = -100.9
-1x = -100.9

Divide each side by '-1'.
x = 100.9

Simplifying
x = 100.9